The amine that reacts with `NaNO_(2)+HCl` to give yellow oily liquid is

Options

A. ethylamine
B. diethylamine
C. isopropylamine
D. secondary butylamine

Explanation

To solve the question regarding which amine reacts with `NaNO₂ + HCl` to give a yellow oily liquid, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
The reaction of amines with nitrous acid (which is generated from `NaNO₂` and `HCl`) leads to the formation of a diazonium salt. The type of amine (primary, secondary, or tertiary) will determine the outcome of this reaction.

2. **Identifying the Type of Amine**:
- **Primary Amines**: React with nitrous acid to form diazonium salts, which can further decompose to give nitrogen gas and an alcohol.
- **Secondary Amines**: React to form N-nitrosoamines, which are typically yellow oily liquids.
- **Tertiary Amines**: Do not react with nitrous acid in the same way and do not produce diazonium salts.

3. **Conclusion on the Type of Amine**:
Since the question specifies that the product is a yellow oily liquid, it indicates that the amine must be a secondary amine. This is because secondary amines react with nitrous acid to form N-nitrosoamines, which are characterized by their yellow oily appearance.

4. **Final Answer**:
The amine that reacts with `NaNO₂ + HCl` to give a yellow oily liquid is a **secondary amine**.